Is this a fossil, bone, or odd rock?

[Boarteats]

Found this in my backyard stream. Shape and size looks like a very large animal bone. General shape reminds me of a pig tibia, but this would have had to come from a really big porker. Haven't been any large farm or wild animals in this area in well over 100 yrs. Any chance that this is a legit fossil? It's quite heavy. See pictures below.

 

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